While instructing my younger son, who'll soon be licensed, to change
the rear pads on the 93 940 wagon this past Sunday, I found the
passenger side caliper had a piston stuck. I have him install it
anyway so the car can be back on the road. The new pads won't go in by
the way because of the stuck piston. I have him put in a used pad I
happen to save in a box.

I presume a rebuild kit won't do because the caliper probably needs to
be replaced. So getting a rebuild caliper is the way to go.

Now the question.

Is there a way to tell which caliper the car has? The mail order
outfit says there are three different types of calipers for my car,
36mm piston, 38mm and 40mm. I really hate to take the wheel off to
check again.

Visit your dealer with your VIN. He should be able to confirm which
callipers are fitted to your car.
All the best, Peter.

700/900/90 Register Keeper,
Volvo Owners Club (UK).

"yaofeng" <yaofengchen@gmail.com> wrote in message
news:1130260854.226729.250030@g43g2000cwa.googlegroups.com...
> While instructing my younger son, who'll soon be licensed, to change
> the rear pads on the 93 940 wagon this past Sunday, I found the
> passenger side caliper had a piston stuck. I have him install it
> anyway so the car can be back on the road. The new pads won't go in by
> the way because of the stuck piston. I have him put in a used pad I
> happen to save in a box.
>
> I presume a rebuild kit won't do because the caliper probably needs to
> be replaced. So getting a rebuild caliper is the way to go.
>
> Now the question.
>
> Is there a way to tell which caliper the car has? The mail order
> outfit says there are three different types of calipers for my car,
> 36mm piston, 38mm and 40mm. I really hate to take the wheel off to
> check again.
>

yaofeng wrote:
>
> While instructing my younger son, who'll soon be licensed, to change
> the rear pads on the 93 940 wagon this past Sunday, I found the
> passenger side caliper had a piston stuck. I have him install it
> anyway so the car can be back on the road. The new pads won't go in by
> the way because of the stuck piston. I have him put in a used pad I
> happen to save in a box.
>
> I presume a rebuild kit won't do because the caliper probably needs to
> be replaced. So getting a rebuild caliper is the way to go.
>
> Now the question.
>
> Is there a way to tell which caliper the car has? The mail order
> outfit says there are three different types of calipers for my car,
> 36mm piston, 38mm and 40mm. I really hate to take the wheel off to
> check again.

There is supposed to be a stamped number on the inside of the caliper
(visible from under the car without wheel removal), but I've never seen
one that was legible. There's no way to tell any way except measuring
the piston, but in my experience I've only seen 40 mm ones on wagons.

--
Mike F.
Thornhill (near Toronto), Ont.

Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)

Mike F wrote:
> yaofeng wrote:
> >
> > While instructing my younger son, who'll soon be licensed, to change
> > the rear pads on the 93 940 wagon this past Sunday, I found the
> > passenger side caliper had a piston stuck. I have him install it
> > anyway so the car can be back on the road. The new pads won't go in by
> > the way because of the stuck piston. I have him put in a used pad I
> > happen to save in a box.
> >
> > I presume a rebuild kit won't do because the caliper probably needs to
> > be replaced. So getting a rebuild caliper is the way to go.
> >
> > Now the question.
> >
> > Is there a way to tell which caliper the car has? The mail order
> > outfit says there are three different types of calipers for my car,
> > 36mm piston, 38mm and 40mm. I really hate to take the wheel off to
> > check again.
>
> There is supposed to be a stamped number on the inside of the caliper
> (visible from under the car without wheel removal), but I've never seen
> one that was legible. There's no way to tell any way except measuring
> the piston, but in my experience I've only seen 40 mm ones on wagons.
>
> --
> Mike F.
> Thornhill (near Toronto), Ont.
>

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